Show that four points whose position vectors are are coplanar.

Formula : -


and then



(iii) Three vectorsare coplanar if and only if


(iv) If andthen,


let






The four points are coplanar if the vector are coplanar.



now, using



= 10(100 + 12) + 12( – 60 – 24) – 4( – 12 + 40) = 0.


hence the point are coplanar


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